Just before they part, Harry learns that Dumbledore has been keeping him under observation in order to protect him after what had happened with Voldemort last month.
When Aunt Petunia and Uncle Vernon notice Dudley in his sickly state they fawn over him and Harry attempts to slip away, but Dudley speaks and assumes that Harry attacked him with some sort of spell since Muggles cannot see Dementors.
Harry immediately denies it and when Harry takes out his wand and pretends to curse Dudley with it; a cold chill comes onto the duo and Harry and Dudley are then attacked by Dementors.
The Weasleys, Hermione Granger, and Harry’s godfather Sirius Black are there.
While the Order of the Phoenix are having a meeting, Mrs Weasley takes Harry to the room where Ron and Hermione are before heading back.
Harry Potter remains at his house, 4 Privet Drive, living with his Muggle aunt, uncle and cousin and severely cut off from the rest of the wizarding world.
The neighbourhood is suffering from an exhausting heat wave and due to this, Harry spends the majority of his summer out of the house, going on walks and trying to avoid his aunt and uncle as much as possible because the paranoid pair won't stop badgering him over his interest in the news.
Harry attempts the Patronus Charm three times and is successful on the last try, and is surprised to find Mrs Figg, his old, cat-loving neighbour, storming up the road towards the two teenagers.